Rafael Nadal of Spain sists in his chair as he waits for the presentation ceremony to begin after he lost to Novak Djokovic of Serbia during the final of the ATP World Tour Finals at the O2 Arena in London, Monday, Nov. 11, 2013. (AP Photo/Kirsty Wigglesworth)

Britain Tennis ATP Finals

Rafael Nadal of Spain sists in his chair as he waits for the presentation ceremony to begin after he lost to Novak Djokovic of Serbia during the final of the ATP World Tour Finals at the O2 Arena in London, Monday, Nov. 11, 2013. (AP Photo/Kirsty Wigglesworth)

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